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Airplanes fly in formation over Boulder during an aerial parade on Thursday, May 14, 2020. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

Gary Winder, left, grabs a Colorado flag from Mile High Air Boss Bob Evans while riding in a SNJ-5 aircraft during the start of an aerial parade on Thursday, May 14, 2020 at Rocky Mountain Metropolitan Airport in Broomfield. A squadron of more than 30 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

Gil Gilmore, 9, holds an American flag while watching airplanes taxi down the runway during the start of an aerial parade on Thursday, May 14, 2020 at the Rocky Mountain Metropolitan Airport in Broomfield. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

Spectators watch airplanes taxi down the runway during the start of an aerial parade on Thursday, May 14, 2020 at the Rocky Mountain Metropolitan Airport in Broomfield. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

Pilot Carl Benda does a pre-flight inspection on his Chinese Nanchang CJ-6 aircraft during the start of an aerial parade on Thursday, May 14, 2020 at the Rocky Mountain Metropolitan Airport in Broomfield. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

Airplanes fly in formation over Boulder during an aerial parade on Thursday, May 14, 2020. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

An airplane flies overhead during an aerial parade on Thursday, May 14, 2020 at the Rocky Mountain Metropolitan Airport in Broomfield. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

A teddy bear sits in the cockpit of Capt. Tom Gordon's U.S. Army L-17B aircraft during the start of an aerial parade on Thursday, May 14, 2020 at the Rocky Mountain Metropolitan Airport in Broomfield. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

Pilot Stephen Hayne listens to a pre-flight briefing during the start of an aerial parade on Thursday, May 14, 2020 at the Rocky Mountain Metropolitan Airport in Broomfield. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

Airplanes fly in formation over Boulder during an aerial parade on Thursday, May 14, 2020. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

Pilot Don Nelson, left, talks with Mile High Air Boss Bob Evans before taking off at the start of an aerial parade on Thursday, May 14, 2020 at the Rocky Mountain Metropolitan Airport in Broomfield. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

Airplanes fly in formation over Boulder during an aerial parade on Thursday, May 14, 2020. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

Air Boss Scott McMillan gives a pre-flight briefing to pilots during the start of an aerial parade on Thursday, May 14, 2020 at the Rocky Mountain Metropolitan Airport in Broomfield. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

Airplanes fly in formation over Boulder during an aerial parade on Thursday, May 14, 2020. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

Gil Gilmore, 9, holds an American flag while watching airplanes taxi down the runway during the start of an aerial parade on Thursday, May 14, 2020 at Rocky Mountain Metropolitan Airport in Broomfield. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

Mile High Air Boss Scott McMillan carries a Colorado flag during the start of an aerial parade on Thursday, May 14, 2020 at Rocky Mountain Metropolitan Airport in Broomfield. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)

An airplane sits on the runway before takeoff during the start of an aerial parade on Thursday, May 14, 2020 at the Rocky Mountain Metropolitan Airport in Broomfield. A squadron of 40 airplanes flew across the front range of Colorado for an aerial fundraiser and salute to essential workers during the coronavirus pandemic. (Jeremy Papasso/Staff Photographer)